A military spokesperson dismissed it as an accident a gas storage facility in a "public area" of Parchin, about 20 miles southeast of Tehran, in statements to sate TV, but it didn't take long for analysts in the West to identify the area as being close to alleged secretive missile factories.
Initially on Friday even Iranian media described the explosion, heard and seen for miles, as a mystery blast. "The cause of this sound and light is not yet known, but it was clearly heard in Pardis, in Boumhen and surrounding areas" of the Iranian capital, Mehr news agency had reported.
Further fueling the speculation is that tensions with Israel and the United States are still soaring, given Iran's moving forward with developing uranium enrichment capabilities - blowing past caps in place under the JCPOA - which Tehran has all along said is for peaceful nuclear energy.
But Israel believes Tehran both pursuing warheads and the ability to launch.
, given Israeli Air Force strikes on Iranian targets inside Syria have become so frequent as to be a near weekly occurrence of late.